<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JS/CSS在屏幕底部弹出消息(snackbar)</title>
    <style>
        #snackbar {
            visibility: hidden;
            min-width: 250px;
            margin-left: -125px;
            background-color: #333;
            color: #fff;
            text-align: center;
            border-radius: 2px;
            padding: 16px;
            position: fixed;
            z-index: 1;
            left: 50%;
            bottom: 30px;
            font-size: 17px;
        }

        #snackbar.show {
            visibility: visible;
            -webkit-animation: fadein 0.5s, fadeout 0.5s 2.5s;
            animation: fadein 0.5s, fadeout 0.5s 2.5s;
        }
    </style>
</head>

<body>
    <h2>Snackbar / Toast</h2>
    <p>在屏幕底部弹出消息,作用与使用方法都与Toast类似</p>
    <p>点击按钮显示提示信息，3 秒后消失</p>
    <button onclick="myFunction()">显示 Snackbar</button>
    <div id="snackbar">XNM</div>
    <script>
        function myFunction() {
            var x = document.getElementById("snackbar")
            x.className = "show";
            setTimeout(function () { x.className = x.className.replace("show", ""); }, 3000);
        }
    </script>
</body>

</html>